Heat dissipating system and duct cover thereof

ABSTRACT

A heat dissipating system includes a chassis, a number of heat dissipating members received in the chassis, and a number of duct cover. The chassis defines a number of cavities corresponding to the outlets of the heat dissipating members is defined in the chassis. Each duct cover includes an outer flap and an inner flap. An opening is defined in the outer flap. The outer flap is rotatably mounted to the chassis to cover or uncover the corresponding cavity. The inner flap is rotatably mounted to the outer flap to cover or uncover the opening.

BACKGROUND

1. Technical Field

The present disclosure relates to systems and, more particularly, to a heat dissipating system having an duct cover.

2. Description of the Related Art

It is important to adopt positive heat dissipating mode with a plurality of fans to dissipate heat from an electrical device such as a server. But if one of the plurality of fans is disabled or malfunctions, hot air circumfluence will be produced and heat dissipating for the electrical device will decline. Referring to FIG. 1, a heat dissipating system 100 includes a chassis 30, and first and second fans 10 and 20. The heat dissipating system 100 is configured for dissipating heat produced by electrical elements from the chassis 30 receiving the electrical elements. When the first and second fans 10 and 20 are at normal working states, the first and second fans 10 and 20 dissipate heat produced by the electrical elements from the chassis 30. If the first fan 10 is disabled or malfunctions, a part of hot air blown out of the chassis 30 by the second fan 20 will travel into the chassis 30 via the first fan 10, which influences heat dissipating for the chassis 30. The same is true if the second fan 20 stops working the first fan is working.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a related art heat dissipating system.

FIG. 2 is an exploded, isometric view of an exemplary embodiment of a heat dissipating system, the heat dissipating system including two duct covers.

FIG. 3 is an enlarged view of one of the duct covers of FIG. 2.

FIG. 4 is an assembled, isometric view of FIG. 2.

FIGS. 5 and 6 are similar to FIG. 4, but showing two different using states.

DETAILED DESCRIPTION

Referring to FIG. 2, an exemplary embodiment of a heat dissipating system 200 for an electronic device, such as a server, includes a chassis 50, a first heat dissipating member such as a first fan 52, a second heat dissipating member such as a second fan 54, and two duct covers 40.

The chassis 50 is capable of receiving the first fan 52 and the second fan 54. Two cavities 53 are defined in a sidewall of the chassis 50, respectively aligning with outlets of the first and second fans 52 and 54 to make hot air blown by the first and second fans 52 and 54 out of the chassis 50 via the two cavities 53. Two cylindrical collars 56 extend from a sidewall of the chassis 50, aligned at an upper portion, and at opposite sides of each of the cavities 53. A pivot hole is defined in each collar 56, and the pivot holes are aligned on a straight line.

Referring to FIG. 3, each duct cover 40 includes a rectangular outer flap 42 and a rectangular inner flap 44. A rectangular opening 422 is defined in the outer flap 42. Two cylindrical collars 424 extend from the outer flap 42, aligned at an upper portion, and at opposite sides of the opening 422. A pivot hole is defined in each collar 424, and the pivot holes are aligned on a straight line. Two cylindrical pivot shafts 426 extend from opposite ends of a top side of the outer flap 42, to be rotatably engaged in the pivot holes of the collars 56 of the chassis 50.

The area of the inner flap 44 is greater than or equal to the area of the opening 422 of the outer flap 42, while smaller than the area of the outer flap 42. Two cylindrical pivot shafts 442 extend from opposite ends of a top side of the inner flap 44, to be rotatably engaged in the pivot holes of the collars 424 of the outer flap 42. In one embodiment, the outer and inner flaps 42 and 44 are made of plastic.

Referring to FIG. 4, in assembly, the pivot shafts 442 of each inner flap 44 are rotatably engaged in the pivot holes of the collars 424 of each outer flap 42, to rotatably mount the inner flap 44 to the outer flap 42. The pivot shafts 426 of the outer flap 42 are rotatably engaged in the pivot holes of the collars 56 of the chassis 50, to rotatably mount the outer flap 42 to the sidewall of the chassis 50. When the first and second fans 52 and 54 are not used, the inner flaps 44 cover the openings 422 of the corresponding outer flaps 42, and the outer flaps 42 cover the cavities 53 of the sidewall of the chassis 50.

Referring to FIG. 5, in use, when the first and second fans 52 and 54 operate at lower rotating speeds, hot air in the chassis 50 is blown by the first and second fans 52 and 54, driving the inner flaps 44 to rotate around the pivot shafts 442. Therefore, the inner flaps 44 uncover the openings 422 of the corresponding outer flaps 42, allowing heat in the chassis 50 being discharged through the openings 422 of the outer flaps 42.

Referring to FIG. 6, when the first and second fans 52 and 54 operate at higher rotating speeds, hot air in the chassis 50 is blown by the first and second fans 52 and 54, driving the outer flaps 42 to rotate around the corresponding pivot shafts 426. As a result, the outer flaps 42 uncover the corresponding cavities 53 of the chassis 50, allowing heat in the chassis 50 to discharge through the cavities 53 of the chassis 50.

when the first fan 52 is disabled or malfunctions while the second fan 54 operates at a lower rotating speed, hot air in the chassis 50 is blown by the second fan 54, driving the corresponding inner flap 44 to rotate around the pivot shafts 442 to uncover the opening 422 of the corresponding outer flap 42. When the first fan 52 is disabled or malfunctions, while the second fan 54 operates at a higher rotating speed, hot air in the chassis 50 is blown by the second fan 54, driving the corresponding outer flap 42 to rotate around the pivot shafts 426 to uncover the corresponding cavity 53 of the chassis 50. The outer and inner flaps 42 and 44 corresponding to the first fan 52 still cover the corresponding cavity 53 and the openings 422 due to gravity of the outer and inner flaps 42 and 44. Therefore, the hot air discharged through the cavity 53 or the opening 422 that corresponds to the second fan 54 will not travel into the chassis 50 through the cavity 53 or the opening 442 that corresponds to the first fan 52.

It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

1. A heat dissipating system comprising: a chassis with a plurality of cavities defined in the chassis; a plurality of heat dissipating members received in the chassis, each heat dissipating member having an outlet, wherein the outlets of the plurality of heat dissipating elements are aligned with the plurality of cavities accordingly; and a plurality of duct covers mounted to the chassis, each duct cover comprising an outer flap rotatably mounted to the chassis to cover or uncover a corresponding cavity and an inner flap, wherein the outer flap defines an opening, the inner flap is rotatably mounted to the outer flap to cover or uncover the opening.
 2. The heat dissipating system of claim 1, wherein each cavity of the chassis is rectangular, the outer flap of each duct cover is rectangular to suit for the corresponding cavity.
 3. The heat dissipating system of claim 1, wherein two collars extend from the outer flap, aligned at an upper portion, and at opposite sides of the opening, a pivot hole is defined in each collar, and the pivot holes are aligned on a straight line, two pivot shafts extend from opposite ends of a top side of the inner flap, to be rotatably engaged in the pivot holes of the collar of the outer flap to rotatably mount the inner flap to the outer flap.
 4. The heat dissipating system of claim 1, wherein two collars extend from the chassis, aligned at an upper portion, and at opposite sides of each of the cavities, a pivot hole is defined in each collar, and the pivot holes are aligned on a straight line, two pivot shafts extend from opposite ends of a top side of the outer flap, to be rotatably engaged in the pivot holes of the collars to rotatably mount the outer flap to the chassis.
 5. The heat dissipating system of claim 1, wherein the opening of each outer flap is rectangular, and the inner flap is rectangular to suit for the opening.
 6. The heat dissipating system of claim 1, wherein the first and inner flaps are made of plastic.
 7. An duct cover configured for covering an cavity of a chassis, the duct cover comprising: a outer flap capable of being rotatably mounted to the chassis, wherein the outer flap defines an opening; and a inner flap rotatably mounted to the outer flap to cover or uncover the opening; wherein the area of the inner flap is greater than or equal to the area of the opening of the outer flap, while smaller than the area of the outer flap.
 8. The duct cover of claim 7, wherein two collars extend from the outer flap, aligned at an upper portion, and at opposite sides of the opening, a pivot hole is defined in each collar, and the pivot holes are aligned on a straight line, two pivot shafts extend from opposite ends of a top side of the inner flap, to be rotatably engaged in the pivot holes of the collar of the outer flap to rotatably mount the inner flap to the outer flap.
 9. The duct cover of claim 7, wherein two pivot shafts extend from opposite ends of a top side of the outer flap, to rotatably mount the outer flap to the chassis.
 10. The duct cover of claim 7, wherein the opening is rectangular, and the inner flap is rectangular to suit for the opening.
 11. The duct cover of claim 7 being made of plastic. 